Malicious PDF — malware analysis report

Static analysis result for SHA-256 d866ff518aa45244…

MALICIOUS

PDF

77.9 KB Created: 2021-03-06 08:16:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: ed5069376b3664b06c2532a8b50f4214 SHA-1: cbce6cbd58b15fca0486ce831129c522a8ee9969 SHA-256: d866ff518aa45244e74b805af19f3abbc9dc0629d9178430551a14f987af6bf9
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, identified as a link farm, with many pointing to disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded links suggest an attempt to redirect users to potentially malicious sites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://seumenha.ru/strik?utm_term=wagner+flexio+590+review PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4451212/normal_602afa22baf10.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385230/normal_60431d20664c4.pdfIn PDF document text
    • http://bilet-pdd.site/mibamisasimegodaxawrrg6e.pdfIn PDF document text
    • http://prizinsta365.site/juegos_de_transformers_autobot_stronghold_hackedkbino.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374207/normal_603c4291300b8.pdfIn PDF document text
    • http://huaweistoreukr.xyz/buy_harry_potter_book_set_hardcover7m0fp.pdfIn PDF document text
    • http://custits.space/sm_1223_manuala6haw.pdfIn PDF document text
    • http://ogranifruit.space/bezetapirevetoborjrfwb.pdfIn PDF document text
    • http://sodalabs.club/35609208831sww74.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413225/normal_6023c71950788.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473340/normal_5ff8bbc91efa7.pdfIn PDF document text
    • http://help-feedback-amzn8.xyz/physiology_linda_costanzo_6th_edition_free_downloadjcwor.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420018/normal_600777c43c88d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471985/normal_602bf0db0c9b9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459654/normal_5fe302693a835.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376127/normal_5ffb13f8aac4f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/66d509b7-1eb4-4fb9-9ce0-ceb6049a08ed/why_does_my_electric_oven_not_work.pdfIn PDF document text
    • https://b01ec662-dec5-4f54-b977-8708717d6054.filesusr.com/ugd/07e02c_5f9ef7b6a5634ae1be5eb805a36d4567.pdf?index=trueIn PDF document text
    • https://b5d51143-f34a-4a4f-9265-6917490cb775.filesusr.com/ugd/9f69bd_a598d3e1a6b544c58dc438226c05b895.pdf?index=trueIn PDF document text
    • https://9e77dbea-16d6-438e-9859-4a68c5388828.filesusr.com/ugd/3225da_ad482886e4bf4fd0bf964e1c42933429.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/033459cd-069a-4cc9-90d0-f0d083aab72e/bhagavad_gita_chapter_16_in_hindi.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AF 5412 bytes
SHA-256: 78d684dd9f6a8945a11ca21ec0734490970523b16395c0c29e0d05512f756d33
font_01_sfnt_off00010654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10654 10680 bytes
SHA-256: 7c6424e2742c448c021c2ae556af81e88449486a1ff6708b0ab06a5115692153

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